[dolgoed]

Hi my koi has what looks like small cotton wool patches on his tail doesnt seem to be affecting its behaviour at the moment. I have some medicines but they say do not use below a certain temp. What can i use????

[asmithafc]

sounds like koi pox is that what your treating it for?

[worthy]

Originally Posted by dolgoed

Hi my koi has what looks like small cotton wool patches on his tail doesnt seem to be affecting its behaviour at the moment. I have some medicines but they say do not use below a certain temp. What can i use????

If it is cotten like sound like a small fungal infection but if the lump is waxy then it is carp pox and if so it will go once the weather warms up but if a fungal infection it will need treating and as for the treatment saying not under a certern temp it just means it will take longer as the fish will heal better in warmer water

[moz]

Sounds fungal to me,
As Worthy said carp pox is a waxy lump which will dissapear as the temperature rises but a fungal infection will need treating.
There is quite often an underlying cause to a fungal infection like a wound caused to the fish. This will probably need treating as well as the fungus.
Carp pox is usually found on more than one fish too.
Do you have a quarantine pond?
Can you upload any photos of infected fish?
Pictures will help us to diagnose problems more accuratley instead of semi guessing. But I know im right about what ive wrote above lol.